He only lives when the sun goes down. And I promised to be his light until the night ends. Riki was born into luxury, but behind the walls of his perfect life lies a cruel secret-a rare illness that makes daylight deadly. He's trapped in a world where the sun is his enemy, and the night is his only refuge. No friends. No normal life. Just endless darkness. Until Jungwon comes. Hired as Riki's bodyguard, Jungwon is everything he never expected-a protector, a friend, and slowly, so much more. He becomes Riki's first smile, first laugh, first touch, and the first person to truly see him. But freedom comes at a price. And when Jungwon uncovers the only chance to save Riki, it might cost them everything. How far would you go for the one you love... before the night ends?